In Seaberry Beach Party, Gingersnap, Angel Cake, and Orange Blossom listen to the roar of the ocean in SSC's seashells. SSC looks through her "remembering book" and shares two sea tales. In the first story, "Coco Calypso and the Mystery of the Seaberry Shore", the seaberries are disappearing. Coco, who lives on the beach, solves the mystery and meets a new friend, Seaberry Delight, who lives in the lagoon underwater. Other characters featured in this episode are Papaya Parrot, Rainbow Sherbert, and Blueberry Muffin.

What is more precious than gold? Find out in the second story. Rainbow and Blueberry haggle over sand dollars they find on the beach. To stop the friends from fighting, Seaberry Delight tells them "The Legend of the Lost Treasure." SSC and her friends are mermaids who face a greedy Sea Serpent hoarding the precious "solid gold" sand dollars.